78073 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 45% of adults in 78073 typically vote, below the U.S. average of about 62%. Among adults in 78073, ~21% vote Democratic, ~24% Republican, and ~55% don't vote. The map below shows estimated turnout by block group.
How 78073 compares
Among zip codes within 15 miles, 78073 leans more Republican than 17 of 26 neighbors.
78073 runs about 6 points more Democratic than Texas as a whole.
Politics vary noticeably by block within 78073. The east side is the most split-leaning (R+12) and the southeast side is the least split-leaning (Even), a spread of about 11 points.
Why 78073 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 78073, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 12% of adults in 78073 hold a bachelor's degree, about 14 points below the Texas average of 26%. A high family-household share predicts Republican voting, and about 78% of households in 78073 are family households, above 89% of zip codes.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 78073, TX sits in the bottom tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 78073 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78073 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 48%, about 6 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 71% of adults in 78073 have completed high school, below 97% of zip codes. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.